Help/Core/UnaryOpFunction.html

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
   2 <html>
   3 <head>
   4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   5 <meta http-equiv="Content-Style-Type" content="text/css">
   6 <title></title>
   7 <meta name="Generator" content="Cocoa HTML Writer">
   8 <meta name="CocoaVersion" content="949.43">
   9 <style type="text/css">
  10 p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica}
  11 p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px}
  12 p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #bf0000}
  13 p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #000000}
  14 p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #832519; min-height: 12.0px}
  15 p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; color: #0021e7}
  16 p.p7 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; color: #0047e4}
  17 span.s1 {font: 18.0px Helvetica}
  18 span.s2 {color: #000000}
  19 span.s3 {font: 12.0px Helvetica; color: #0021e7}
  20 span.s4 {font: 12.0px Helvetica; color: #0024f8}
  21 span.s5 {font: 12.0px Helvetica; color: #0047e4}
  22 span.s6 {font: 12.0px Helvetica; color: #0000ff}
  23 span.s7 {color: #0000bf}
  24 span.s8 {color: #007300}
  25 span.Apple-tab-span {white-space:pre}
  26 </style>
  27 </head>
  28 <body>
  29 <p class="p1"><span class="s1"><b>UnaryOpFunction<span class="Apple-tab-span">  </span></b></span><b>represent a unary oparation on a function</b></p>
  30 <p class="p2"><br></p>
  31 <p class="p1"><b>superclass: AbstractFunction</b></p>
  32 <p class="p2"><br></p>
  33 <p class="p1">Operating on functions instead of numbers, what results is not a result of the calculation, but a structure that represents that calculation.</p>
  34 <p class="p2"><br></p>
  35 <p class="p3">// example</p>
  36 <p class="p3"><span class="s2">a = 2.sqrt; </span>// result is square root of two (approximate floating point).</p>
  37 <p class="p3"><span class="s2">a = { b }.sqrt; </span>// result is<span class="Apple-converted-space">  </span>a UnaryOpFunction</p>
  38 <p class="p4">b = 2;</p>
  39 <p class="p3"><span class="s2">a.value; </span>// now it is evaluated, and the result is calculated</p>
  40 <p class="p4">b = 9;</p>
  41 <p class="p3"><span class="s2">a.value; </span>// again, with a different value.</p>
  42 <p class="p5"><br></p>
  43 <p class="p6"><span class="s2">see also: <a href="BinaryOpFunction.html"><span class="s3">BinaryOpFunction</span></a>, <a href="NAryOpFunction.html"><span class="s4">NAryOpFunction</span></a></span></p>
  44 <p class="p7"><span class="s2">related: <a href="../Streams-Patterns-Events/UnaryOpStream.html"><span class="s5">UnaryOpStream</span></a>, <a href="../Streams-Patterns-Events/Patterns/Punop.html"><span class="s6">Punop</span></a></span></p>
  45 <p class="p2"><br></p>
  46 <p class="p2"><br></p>
  47 <p class="p3">// sound example</p>
  48 <p class="p4">(</p>
  49 <p class="p4"><span class="s7">var</span> a = { 19.rand };</p>
  50 <p class="p4"><span class="s7">var</span> b = a.sqrt;</p>
  51 <p class="p4">fork {</p>
  52 <p class="p4"><span class="Apple-tab-span">     </span>15.do {</p>
  53 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>(instrument: <span class="s8">\default</span>, note: [a.value, b.value]).play;</p>
  54 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>0.3.wait;</p>
  55 <p class="p4"><span class="Apple-tab-span">     </span>}</p>
  56 <p class="p4">}</p>
  57 <p class="p4">)</p>
  58 </body>
  59 </html>